* Simplifying documentation for getting started: Removed outdated information about install Golang on different platforms and instead included a link to the official Golang website which has more up to date information. Instructions for installing docker-compose have also been added.
* Added documentation to all exported functions and structs.
* Unexported some structures and functions that were needlessly exported.
* Adding golang CI default configuration which can be useful while developing and may be turned on later in the CI.
* Moving build process in CI to xenial.
* Reducing line size. in some files and shadowing in some test cases.
